About RvO Numismatics

I am a collector and researcher of (Dutch) medieval coins and world coins. What I do: Offering coins for sale and buying coins on internet. Supporting other collectors in research and organisation of collections. Making people interested in coin collecting and numismatics in general by offering collectible coins from medieval times up to c. 1800 to collectors worldwide through internet, and research/publish about the historical background of coins and related subjects.

125 years Royal Dutch Numismatic Society

On 16th and 17th June 2017 the Royal Dutch Numismatic Society celebrated its 125-year anniversary in Utrecht. A two day conference was held with speakers on a variety of subjects.

The members of the society were presented with a medal in bronze and the book “Canon van ons geld”, an overview of 50 items connected to Dutch numismatic history.



De canon van ons geld

The Leeuwengroten of the County of Holland

Once again, we are pleased to announce the publication of the latest in our on-going series of papers regarding the medieval leeuwengroot, or gros au lion coins. Until now, the leeuwengroten of the County of Holland have never been properly or adequately documented (including the well-known works on Holland coins by v.d. Chijs and Grolle)

Also included in the report are the fractional coins (i.e. 1/2 groten etc.), insofar as is possible.

The report can be found on Academia via this link Holland Leeuwengroten report


Over the past months we have been looking at several coin hoards from the Netherlands and visited some public and private collections. The most common gros compagon found today is Type V issued byLouis of Male, count of Flanders (1346-1384). Having seen many of them and compared them with exisiting literatur we were able to identify sub-groups that went unnoticed untill now.

The complete report can be found here

VLA002 leeuwengroot Kz

The Coins of the Flanders Hoard 1914-1918

As an ongoing process for our research on the medieval lion groats form the Low Countries (Netherlands, Belgium and Luxemburg) and France, we looked at another old coin hoard, found during WWI in Flanders and reported in 1956 in the Royal Numismatic Society’s Numismatic
Chronicle by R.H.M. Dolley – “A Small Find of Fourteenth Century Groats From Flanders”.

By kind permission of the Royal Numismatic Society we could use the pictures of Dolley’s article for our research.

By this time we have to develop our theory of dating some of the Flemish emissions of the leeuwengroten. Which has some consequences for dating the hoard.

the report can be found at here.

The Coins of the Albecq Hoard (1995)

As part of our research in to the medieval lion groat (gros compagnon or leeuwengroot), we have looked at another coin hoard containing these coins. This time it was the Albecq Hoard found in 1995, on Guernsey. A place we did not expect lion groats to have circulated.

You can find the report at Academia.edu via this link: The Coins of the Albecq Hoard (1995)


The following link contains an excerpt of the research I’m doing together with two other numismatists into the appearance of Dutch gold ducats and its imitations in Central Asia and Northern India and the monetary aspects of this appearance . More data has been collected to be published at a later date. A presentation about the subject was given in 2009 by Arent Pol at the XIV International Numismatic Congress in Glasgow.

Follow the link here: The many faces of a ducat or here

if you have information regarding this subject, please let me know.

IMI010 Non-TOA Ducat Rev

IMI010 Non-TOA Ducat Obv